Yield pillar sizing : an empirical approach

Details

• Personal Author:
  Kneisley, Richard O. ; Rock, Alan D.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "An empirical method, based on U. S. Bureau of Mines field studies in several Western U.S. coal mines, is presented for sizing gate road yield pillars. Discriminant analysis was used to generate functions separating successful from unsuccessful case studies. These functions relate the pillar width-height and extraction ratios and a pillar development factor to the Coal Mine Roof Rating System (CMRR), and are assumed to establish three criteria that other entry systems, under similar conditions, must satisfy. A program, Pillar Sizer, from user-provided inputs, generates a range of pillar sizes that meets the proposed criteria. Although the analysis is based on a sample consisting primarily of two-entry systems, the derived expressions generate pillar sizes closely agreeing with observed, two-entry and three-entry in situ pillars. It is concluded that the proposed approach should assist mine operators estimate entry system yield pillar dimensions." - NIOSHTIC-2
  
  NIOSHTIC no. 10005498
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  iv, 29 numbered pages
• NIOSHTIC Number:
  nn:10005498
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:142b560b7690f11563e6349c1a5a4f39a28665ded3a0feb5b414a94e6d06212c67090f4f8bc779cdece6cb2908c6d42296c067eebf4892fdcdfe178991c72871
• Download URL:
  https://stacks.cdc.gov/view/cdc/10282/cdc_10282_DS1.pdf
• File Type:
  [PDF - 787.32 KB ]